1,018 results
Showing 1–20 · 1.64 seconds · RSS
Bulletin of the Chemical Society of Ethiopia
Scopus
ISSN 1011-3924 · Chemical Society of Ethiopia · 1,018 articles in the index
-
Journal Article
Efficientone-pot synthesis of imidazoles catalyzed by silica-supported La0.5Pb0.5MnO3 nano particles as anovel and reusable perovskite oxide
Silica-supported La0.5Pb0.5MnO3 nanoparticles was prepared and used as a new perovskite-type catalyst for rapid and efficient synthesis of substituted imidazoles by an one-pot three-component condensation of [9,10]-phenanthraquinone, aryl aldehydes and ammonium acetate in excellent yield under…
-
Journal Article
Health risk assessment of heavy metals via consumption of spinach vegetable grown in Elalla River
Water pollution with heavy metals due to discharge of untreated domestic wastes and surface runoff to the rivers is a major threat for human health that consumes vegetables grown with the polluted river. The present study aimed to examine the contamination of heavy metals through the health risk…
-
Journal Article
Cloud-point extraction and spectrophotometric determination of clonazepam in pharmaceutical dosage forms
Aneco-friendly, simple and very sensitive method was developed for preconcentration and determination of clonazepam (CLO) in pharmaceutical dosage forms using cloud point extraction (CPE) technique. The method is based on cloud point extraction of product from oxidative coupling between reduced CLO…
-
Journal Article
Adsorption of bovine serum albumin onto activated carbon prepared from Elaeagnus stone
In this study, the adsorption of bovine serum albumin was studied using the activated carbon prepared from Elaeagnus stone with chemical activation. Elaeagnus stone activated carbon was characterized using the point of zero charge, Fourier transform infrared spectra, Brunauer-Emmet-Teller method…
-
Journal Article
Synthesis of Schiff bases derived from 2-hydroxy-1- naphth- aldehyde and their tin(II) complexes for antimicribial and antioxidant activities
The current studies were designed to prepare tin(II) complexes of various Schiff base derivatives of 2-hydroxy-1-naphthaldehyde (HN) with L-histidine and sulfamethazine have been prepared and characterized by different physiochemical studies such as elemental analysis, atomic absorption, UV-Vis…
-
Journal Article
A novel samarium complex with interesting photoluminescence and semiconductive properties
[Sm(H2O)4(NO3)3](4,4'-Hbipy)2(NO3)2 (1) (bipy = bipyridine) has been synthesized via hydrothermal reaction and characterized by X-ray diffraction. The title complex features an isolated structure, based on discrete 4,4'-Hbipy moieties, isolated nitrates and [Sm(H2O)4(NO3)3] species. The samarium…
-
Journal Article
Synthesis, characterization and photocatalytic activity of Mn2O3/Al2O3/Fe2O3 nanocomposite for degradation of malachite green
A Mn2O3/Al2O3/Fe2O3 nanocomposite photocatalyst was prepared by a co-precipitation method. Flame atomic absorption spectroscopy (FAAS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and UV–Vis diffuse absorption spectroscopy (UV–Vis…
-
Journal Article
Isolation of non-cytotoxic crotepoxide from the root bark of Croton macrostachyus and the reassignment of its structure
Crotepoxide was isolated for the first time from the root bark of Croton macrostachyus along with other known compounds. This compound along with other compounds was investigated for cytotoxicity and found to be not active against the human cervix carcinoma KB-3-1 cells in micromolar ranges. In…
-
Journal Article
Correlation between caffeine contents of green coffee beans and altitudes of the coffee plants grown in southwest Ethiopia
Caffeine contents of 45 green coffee bean samples collected from coffee plants grown at different altitudes in Southwest Ethiopia was determined by UV-Vis spectrophotometry. The caffeine contents were found in the range of 0.62 - 1.2% (w/w). A moderate negative correlation (R = 0.5463) was found…
-
Journal Article
Synthesis, characterization and crystal structures of hydrazone compounds derived from isonicotinohydrazide
New isonicotinohydrazone compounds, N’-(3-bromobenzylidene)isonicotinohydrazide (1) and N’-(2,3-difluorobenzylidene)isonicotinohydrazide (2), were prepared and structurally characterized by elemental analysis, IR, UV and 1H NMR spectra, and single crystal X-ray determination. Compound 1…
-
Journal Article
Polymethylhydrosiloxane reduction of carbonyl function catalysed by titanium tetrachloride
Reduction of aromatic aldehydes and ketones into the corresponding methylene derivatives by polymethylhydrosiloxane in the presence of titanium tetrachloride as catalyst was achieved in good to excellent yields ranging from 55-90%. The reaction took place under relatively mild conditions and…
-
Journal Article
Selective electrochemical determination of dopamine at p-nitroaniline film-hole modified glassy carbon electrodes
Herein, we report determination of dopamine (DA) at modified glassy carbon electrode (GCE) with a film produced by reduction of diazonium generated from p-nitroaniline (PNA). Pores were created purposely by stripping pre-deposited gold nanoparticles (AuNPs) in the modifier film. The modified…
-
Journal Article
Synthesis and structural characterization of N-(2-{[(2E)-2-(2-hydroxybenzylidene)- hydrazinyl] carbonyl}-phenyl)benzamide (HL) and its Co(II), Fe(III), Cu(II) and Zn(II) complexes. X-ray crystal structure of HL
N-(2-{[(2E)-2-(2-hydroxybenzylidene)hydrazinyl]carbonyl}phenyl)benzamide (HL) and its Co(II), Fe(III), Cu(II) and Zn(II) perchlorate complexes were synthesized. The structures of HL and its complexes were confirmed on the basis of elemental analysis and FT-IR, FT-Raman, 1H-NMR spectra. TGA…
-
Journal Article
Synthesis and biological activities of 3,6-disubstituted-1,2,4-triazolo-1,3,4- thiadiazole derivatives
Twelve novel triazolothiadiazole derivatives were synthesized from 4-amino-5-substituted-4H-1,2,4-triazole-3-thiols with various aromatic carboxylic acids by cyclization in the presence of phosphorous oxychloride. All the newly synthesized compounds were characterized by FTIR, 1H NMR, mass…
-
Journal Article
Synthesis of new nano Schiff base complexes: X-ray crystallography, thermal, electrochemical and anticancer studies of nano uranyl Schiff base complexes
This study presents synthesis and characterization of new nano uranyl Schiff base complexes. Electrochemistry of these complexes showed a quasireversible redox reaction without any successive reactions. Furthermore, X-ray crystallography exhibited that beside the coordination of tetradentate Schiff…
-
Journal Article
Assessment of metals in roasted indigenous coffee varieties of Ethiopia
The metals content (Ca, Cd, Cr, Co, Cu, Fe, K, Mg, Mn, Ni, Pb and Zn) of roasted coffee varieties grown in five different regions of Ethiopia was determined by flame atomic absorption spectrometry. Representative samples were collected from Coffee Quality Inspection and Liquoring Center in the…
-
Journal Article
Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya
Heavy metals’ discharge into the environment continues to pose grave concerns around the world. The efficacy of a hydrous alumino-silicate clay (AlSiM) coming obtained from some regions of Kenya to sorb heavy-metal ions from water has been evaluated in batch tests taking into account changes in…
-
Journal Article
Activity guided isolation of chemical constituents from the biologically active methanol extract of Euphorbia schimperi C. Presl
In this study we investigated the chemical constituents of bioactive methanol extract of Euphorbia schimperi C. Presl. For this the methanol extract was fractionated into 20, 40, 60, 80% MeOH in CHCl3, and 100% MeOH fractions respectively by vacuum liquid chromatography. Excision wound surface of…
-
Journal Article
Uses of acetoacetanilide for the synthesis of thiophene derivatives with cytotoxic activities
The reaction of acetoacetanilide 1 with elemental sulfur and malononitrile 2 gave the thiophene derivative 3. The latter was the key starting material for the synthesis of different thiophene and fused derivatives through its reaction with aryldiazonium chloride, benzaldehyde and acetic anhydride…
-
Journal Article
Chemical constituents and antioxidant activities of the fruits extracts of Piper capense
The fruits of P. capense from Ethiopia were hydro-distilled with Clevenger apparatus to furnish 2.6-2.8% yellowish oil which was analyzed with GC–MS. Results of the GC-MS analysis revealed the presence of twenty one components with the major ones are β-caryophyllene (5%), g-muurolene (7.22%)…
Showing at most 50 pages. Narrow your search with filters for more specific results.